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CERN Document Server 83 εγγραφές βρέθηκαν  1 - 10επόμενοτέλος  μετάβαση στην εγγραφή: Η έρευνα πήρε 1.36 δευτερόλεπτα. 
1.
First observation of the decay $B^+ \to \pi^+ \mu^+\mu^-$ / LHCb Collaboration
A discovery of the rare decay $B^{+} \rightarrow \pi^{+} \mu^{+} \mu^{-}$ is presented. This decay is observed for the first time, with 5.2 $\sigma$ significance. [...]
arXiv:1210.2645; LHCB-PAPER-2012-020; CERN-PH-EP-2012-284; LHCB-PAPER-2012-020; CERN-PH-EP-2012-284.- Geneva : CERN, 2012 - 20 p. - Published in : JHEP 12 (2012) 125 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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2.
Measurement of the fraction of $\Upsilon(1S)$ originating from $\chi_b(1P)$ decays in $pp$ collisions at $\sqrt{s}$ = 7 TeV / LHCb Collaboration
The production of $\chi_b(1P)$ mesons in $pp$ collisions at a centre-of-mass energy of 7 TeV is studied using 32 pb$^{-1}$ of data collected with the LHCb detector. The $\chi_b(1P)$ mesons are reconstructed in the decay mode $\chi_b(1P) \to \Upsilon(1S)\gamma \to \mu^+\mu^-\gamma$. [...]
arXiv:1209.0282; CERN-PH-EP-2012-237; LHCB-PAPER-2012-015; CERN-PH-EP-2012-237; LHCB-PAPER-2012-015.- Geneva : CERN, 2012 - 15 p. - Published in : JHEP 11 (2012) 031 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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3.
Measurement of the ratio of branching fractions $B(B^0 \to K^{\ast 0} \gamma) / B(B^0_s \to \phi \gamma)$ and the direct $C\!P$ asymmetry in $B^0 \to K^{\ast 0} \gamma$ / LHCb Collaboration
The ratio of branching fractions of the radiative B decays B0 -> K*0 gamma and Bs0 phi gamma has been measured using an integrated luminosity of 1.0 fb-1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of sqrt(s)=7 TeV. The value obtained is BR(B0 -> K*0 gamma)/BR(Bs0 -> phi gamma) = 1.23 +/- 0.06(stat.) +/- 0.04(syst.) +/- 0.10(fs/fd), where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. [...]
arXiv:1209.0313; LHCB-PAPER-2012-019; CERN-PH-EP-2012-247; LHCB-PAPER-2012-019; CERN-PH-EP-2012-247.- Geneva : CERN, 2013-02-01 - 21 p. - Published in : Nucl. Phys. B 867 (2013) 1-18 Elsevier Open Access article: LHCb-1-18 - PDF; npb.867.1 - PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint
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4.
Measurement of the $B^0_s \rightarrow J/\psi \bar{K}^{*0}$ branching fraction and angular amplitudes / LHCb collaboration
A sample of 114±11 $B_s^0 → J/ψK^-π^+$ signal events obtained with 0.37  fb$^{-1}$ of pp collisions at √s=7  TeV collected by the LHCb experiment is used to measure the branching fraction and polarization amplitudes of the $B_s^0 → J/ψK̅ ^{*0}$ decay, with $K̅ ^{*0} → K^-π^+$. The $K^-π^+$ mass spectrum of the candidates in the $B_s^0$ peak is dominated by the $K̅ ^{*0}$ contribution. [...]
arXiv:1208.0738; CERN-PH-EP-2012-214; LHCB-PAPER-2012-014; CERN-PH-EP-2012-214; LHCB-PAPER-2012-014.- 2012-10-08 - 16 p. - Published in : Phys. Rev. D 86 (2012) 071102 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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5.
Observation of $B^0 \to \bar{D}^0 K^+ K^-$ and evidence of $B^0_s \to \bar{D}^0 K^+ K^-$ / LHCb Collaboration
The first observation of the decay $B^{0} \to \overline{D}^{0}K^{+}K^{-}$ is reported from an analysis of $0.62 \ \mathrm{fb}^{-1}$ of $pp$ collision data collected with the LHCb detector. Its branching fraction is measured relative to that of the topologically similar decay $B^{0} \to \overline{D}^{0}\pi^{+}\pi^{-}$ to be $\frac{ {\cal B}\left(B^{0} \to \overline{D}^{0}K^{+}K^{-}\right)}{ {\cal B}\left(B^{0} \to \overline{D}^{0}\pi^{+}\pi^{-}\right)} = 0.056 \pm 0.011 \pm 0.007$, where the first uncertainty is statistical and the second is systematic. [...]
arXiv:1207.5991; LHCB-PAPER-2012-018; CERN-PH-EP-2012-198; LHCB-PAPER-2012-018; CERN-PH-EP-2012-198.- Geneva : CERN, 2012-09-26 - 15 p. - Published in : Phys. Rev. Lett. 109 (2012) 131801 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary data: ZIP; External link: Preprint
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6.
Measurement of the effective $B_s^0 \to K^+ K^-$ lifetime / LHCb Collaboration
A precise determination of the effective $B_s^0 \rightarrow K^+ K^-$ lifetime can be used to constrain contributions from physics beyond the Standard Model in the $B_s^0$ meson system. Conventional approaches select $B$ meson decay products that are significantly displaced from the $B$ meson production vertex [...]
arXiv:1207.5993; LHCB-PAPER-2012-013; CERN-PH-EP-2012-172; LHCB-PAPER-2012-013; CERN-PH-EP-2012-172.- Geneva : CERN, 2012-10-02 - 8 p. - Published in : Phys. Lett. B 716 (2012) 393-400 Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
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7.
Study of $D_{sJ}$ decays to $D^+K^0_{\rm S}$ and $D^0K^+$ final states in $pp$ collisions / LHCb Collaboration
A study of $D^+K_S^0$ and $D^0K^+$ final states is performed in a sample of 1.0 fb$^{-1}$ of $pp$ collision data collected at a centre-of-mass energy of $\sqrt{s}=7$ TeV with the LHCb detector. We confirm the existence of the $D_{s1}^*(2700)^+$ and $D_{sJ}^*(2860)^+$ excited states and measure their masses and widths to be \begin{eqnarray} m(D_{s1}^*(2700)^+) &=& 2709.2 \pm 1.9(\mbox{stat})\pm\,\,\,4.5(\mbox{syst})~{\rm MeV}/c^2,\cr \Gamma(D_{s1}^*(2700)^+) &=& \,\,\,115.8 \pm 7.3(\mbox{stat}) \pm12.1(\mbox{syst})~{\rm MeV}/c^2,\cr m(D_{sJ}^*(2860)^+) &=& 2866.1 \pm 1.0(\mbox{stat}) \pm\,\,\,6.3(\mbox{syst})~{\rm MeV}/c^2,\cr \Gamma(D_{sJ}^*(2860)^+) &=& \,\,\,\,\,\,69.9 \pm 3.2(\mbox{stat}) \pm\,\,\,6.6(\mbox{syst})~{\rm MeV}/c^2.\cr\nonumber \end{eqnarray}
arXiv:1207.6016; CERN-PH-EP-2012-181; LHCB-PAPER-2012-016; CERN-PH-EP-2012-181; LHCB-PAPER-2012-016.- Geneva : CERN, 2012 - 12 p. - Published in : JHEP 10 (2012) 151 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
Αναλυτική εγγραφή - Παρόμοιες εγγραφές
8.
Measurement of the $\bar{B}^0_s$ effective lifetime in the $J/\psi f_0(980)$ final state / LHCb Collaboration
The effective lifetime of the $\overline{B}^0_s$ meson in the decay mode $\overline{B}^0_s \to J\psi f_0(980)$ is measured using 1.0fb$^{-1}$ of data collected in $pp$ collisions at $\sqrt{s} = 7$,TeV with the LHCb detector. The result is $1.700 \pm 0.040 \pm 0.026 \,\mathrm{ps}$ where the first uncertainty is statistical and the second systematic. [...]
arXiv:1207.0878; LHCb-PAPER-2012-017; CERN-PH-EP-2012-180; LHCB-PAPER-2012-017; CERN-PH-EP-2012-180.- Geneva : CERN, 2012 - 14 p. - Published in : Phys. Rev. Lett. 109 (2012) 152002 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
Αναλυτική εγγραφή - Παρόμοιες εγγραφές
9.
Measurement of prompt hadron production ratios in $pp$ collisions at $\sqrt{s} = $ 0.9 and 7 TeV / LHCb Collaboration
The charged-particle production ratios $\bar{p}/p$, $K^-/K^+$, $\pi^-/\pi^+$, $(p + \bar{p})/(\pi^+ + \pi^-)$, $(K^+ + K^-)/(\pi^+ + \pi^-)$ and $(p + \bar{p})/(K^+ + K^-)$ are measured with the LHCb detector using $0.3\,{\rm nb^{-1}}$ of $pp$ collisions delivered by the LHC at $\sqrt{s} = 0.9$~TeV and $1.8\,{\rm nb^{-1}}$ at $\sqrt{s} = 7$~TeV. The measurements are performed as a function of transverse momentum $p_{\rm T}$ and pseudorapidity $\eta$. [...]
arXiv:1206.5160; CERN-PH-EP-2012-171; LHCB-PAPER-2011-037; LHCB-PAPER-2011-037; CERN-PH-EP-2012-171.- Geneva : CERN, 2012-10-05 - 30 p. - Published in : Eur. Phys. J. C 72 (2012) 2168 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Rivet analyses reference
Αναλυτική εγγραφή - Παρόμοιες εγγραφές
10.
Measurement of $b$-hadron branching fractions for two-body decays into charmless charged hadrons / LHCb Collaboration
Based on data corresponding to an integrated luminosity of 0.37 fb^-1 collected by the LHCb experiment in 2011, the following ratios of branching fractions are measured: B(B0 -> pi+ pi-) / B(B0 -> K+pi-) = 0.262 +/- 0.009 +/- 0.017, (fs/fd) * B(Bs -> K+K-) / B(B^0 -> K+pi-) = 0.316 +/- 0.009 +/- 0.019, (fs/fd) * B(Bs ->pi+ K-) / B(B0 -> K+pi-) = 0.074 +/- 0.006 +/- 0.006, (fd/fs) * B(B0 -> K+K-) / B(Bs -> K+K-) = 0.018 {+ 0.008 - 0.007} +/- 0.009, (fs/fd) * B(Bs -> pi+pi-) / B(B0 -> pi+pi-) = 0.050 {+ 0.011 - 0.009} +/- 0.004, B(Lambda_b -> p pi-) / B(Lambda_b -> p K-) = 0.86 +/- 0.08 +/- 0.05, where the first uncertainties are statistical and the second systematic. Using the current world average of B(B0 -> K+pi-) and the ratio of the strange to light neutral B meson production fs/fd measured by LHCb, we obtain: B(B0 -> pi+pi-) = (5.08 +/- 0.17 +/- 0.37) x 10^-6, B(Bs -> K+K-) = (23.0 +/- 0.7 +/- 2.3) x 10^-6, B(Bs -> pi+K-) = (5.4 +/- 0.4 +/- 0.6) x 10^-6, B(B0 -> K+K-) = (0.11 {+ 0.05 - 0.04} +/- 0.06) x 10^-6, B(Bs -> pi+pi-) = (0.95 {+ 0.21 - 0.17} +/- 0.13) x 10^-6. [...]
arXiv:1206.2794; LHCB-PAPER-2012-002; CERN-PH-EP-2012-161; LHCB-PAPER-2012-002; CERN-PH-EP-2012-161.- Geneva : CERN, 2012 - 15 p. - Published in : JHEP 10 (2012) 037 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
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CERN Document Server : 83 εγγραφές βρέθηκαν   1 - 10επόμενοτέλος  μετάβαση στην εγγραφή:
Δείτε ακόμη: παρόμοια ονόματα συγγραφέων
82 Lieng, M
9 Lieng, M H
1 Lieng, Magnus
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